simtrace on Mac OSX

Dieter Spaar spaar at
Tue Oct 4 13:34:49 CEST 2011

Hello Holger,

On Tue, 04 Oct 2011 12:48:58 +0200, "Holger Hans Peter Freyther" <holger at> wrote:
> Anyone has a guess? I am going to start to read the Atmel docs now.

I don't have time to debug this issue, but a USB Analyzer trace clearly
shows that the SET ADDRESS command goes wrong.

My guess: The only difference between the Windows and MacOS X trace is
a USB Reset between the GET DESCRIPTOR and SET ADDRESS command on Windows,
the Reset is not there on MacOS X (don't know what Linux does). So I would
look if "upcd.state" is USB_STATE_DEFAULT, if not STD_SET_ADDRESS won't do
anything. From my understanding "upcd.state" is set to USB_STATE_DEFAULT
on a USB Reset, so it might not be initialized properly.

Best regards,
Dieter Spaar, Germany                           spaar at

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